--- product_id: 1627531 title: "NO3:PO4-X 500ml NOPOX - Nitrate & Phosphate Reducer for Reef Aquariums, Promotes Healthy Coral Growth, Controls Algae & Maintains Water" brand: "red sea" price: "R1294" currency: ZAR in_stock: true reviews_count: 13 url: https://www.desertcart.co.za/products/1627531-no3-po4-x-500ml-nopox-nitrate-and-phosphate-reducer-reef store_origin: ZA region: South Africa --- # 500ml precision dosing Compact 3x3x8 inch design Proudly made in the USA NO3:PO4-X 500ml NOPOX - Nitrate & Phosphate Reducer for Reef Aquariums, Promotes Healthy Coral Growth, Controls Algae & Maintains Water **Brand:** red sea **Price:** R1294 **Availability:** βœ… In Stock ## Summary > 🌊 Elevate your reef gameβ€”because your corals deserve the best! ## Quick Answers - **What is this?** NO3:PO4-X 500ml NOPOX - Nitrate & Phosphate Reducer for Reef Aquariums, Promotes Healthy Coral Growth, Controls Algae & Maintains Water by red sea - **How much does it cost?** R1294 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/1627531-no3-po4-x-500ml-nopox-nitrate-and-phosphate-reducer-reef) ## Best For - red sea enthusiasts ## Why This Product - Trusted red sea brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Trusted Quality:** Manufactured in the USA with proven reliability since 2010 - β€’ **Compact & Convenient:** Space-saving 500ml bottle fits perfectly in any reef setup - β€’ **Coral Growth Booster:** Promotes vibrant, healthy coral development for a stunning aquarium - β€’ **Algae Management Mastery:** Controls algae outbreaks, maintaining crystal-clear water clarity - β€’ **Precision Nutrient Control:** Effectively reduces nitrates & phosphates to keep your reef pristine ## Overview Red Sea NO3:PO4-X is a 500ml biological nitrate and phosphate reducer designed to maintain optimal water quality in reef aquariums. Made in the USA, this compact treatment controls algae growth and promotes healthy coral development, ensuring a vibrant and balanced marine environment. ## Description Red Sea Fish Pharm ARE22203 NO3: PO4-X Biological Nitrate and Phosphate Reducer for Aquarium, 500ml ## Features - Country Of Origin: United States - The Package Length Of The Product Is 3 Inches - The Package Width Of The Product Is 3 Inches - The Package Height Of The Product Is 8 Inches ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B006L48D3U | | Best Sellers Rank | #387 in Aquarium Water Treatments | | Date First Available | December 10, 2010 | | Item Model Number | 306049 | | Manufacturer | TopDawg Pet Supply | | Product Dimensions | 3.15 x 7.87 x 3.15 inches; 1 pounds | ## Product Details - **Brand:** Red Sea - **Item Form:** Liquid - **Item Weight:** 16 ounces - **Liquid Volume:** 500 ml - **Unit Count:** 16.9 Fluid Ounces ## Images ![NO3:PO4-X 500ml NOPOX - Nitrate & Phosphate Reducer for Reef Aquariums, Promotes Healthy Coral Growth, Controls Algae & Maintains Water - Image 1](https://m.media-amazon.com/images/I/616rw6PL5yL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Seems to be effective, but READ the instructions completely *by on Reviewed in the United States February 23, 2014* I recently suffered a massive system crash due to high phosphates leaching into my topoff water from the reservoir. I decided to add Red Sea NO3:PO4-X Nitrate & Phosphate Reducer to my repair plan and just see how it went. Now, bear in mind that this was just ONE PART of a multi-step battle plan, so I can't say for sure what worked better, or if anything was useless, or if this was all just blind luck by a dumb guy with a tank, but who knows. I do think it helped, so here's my review:Naturally, Amazon shipping was quick. I read the rest of the reviews, some good, some bad, and decided to give it a go. First off, be sure to read the entire instruction packet. It might seem silly, but there are different dosing regimens for different things you want to do to your tank, so read 'em. When I opened the bottle, I was assaulted by the heady aroma of vinegar and....SOMETHING. Something alcoholic, I think. Yep, you guessed correctly....this stuff is basically a "proprietary blend" of carbon sources. In other words, this is carbon-dosing for idjits.I have no problem with this.I have been afraid of carbon dosing because it seems too fiddly. This product dumbs it down for the rest of us and makes it a relatively easy task. The only thing you need to know about carbon dosing, though, is that once you start, you need to make sure it's done daily. If you decide to stop you need to wean the tank off of it. It's going to promote extra bacterial growth, which will in turn metabolize phosphates and nitrates and bring those terrifying numbers back into an acceptable range. The product claims that this will also promote clarity of the water and greater polyp extension.Well, it's been a few weeks since I started, and I can definitely see a lot of improvement. Dunno if it's the GFO, the UV filter, the massive water change, the Red Sea Reducer, or (most likely) a combination off all of the above. But I DO see much clearer water and coral polyp extension has been great, so I'm gonna go ahead and call that a win for this particular product. My phosphates have dropped from 0.18 on a Hanna checker down to 0.02, and my tank is back to happy again. I'd recommend this product, but I want people to be aware that this IS a carbon dosing source, and those instructions have to be fully read and understood before you start. ### ⭐⭐⭐⭐⭐ Works great *by on Reviewed in the United States June 8, 2026* I've struggled with high nitrates for years. Seam like I tried everything, biopellets, biobricks, chemical resins, nothing seemed to work. My nitrates were at 100ppm in late April when I started dosing NoPox. Combined with a weekly 4 gal water change (13%) tank volume, and my nitrates are now at 2ppm. Actually lower than what I would like. I've reduced the amount t of NoPox I'm dosing and so far its holding steady. Needless to say I'm very happy with the product ### ⭐⭐⭐⭐⭐ It really works! *by on Reviewed in the United States February 12, 2025* It took a while to arrive and based on what I read online I started slowly using about 1/2 the recommended dosage. It worked a little, so I increased the dosage to recommended levels. Wow! It works great and has reduced the nitrate level in my fish only tank considerably and my algae problem is under control. Note, I dosed by hand daily as I do not have a dosing pump. ## Frequently Bought Together - Red Sea NO3:PO4-X 500ml NOPOX - Nitrate & Phosphate Reducer for Reef Aquariums, Promotes Healthy Coral Growth, Controls Algae & Maintains Water - Red Sea Reef Energy Plus 500ml (AB+) All in One Coral Food for Saltwater Aquarium Marine Reef Tanks | Food for Soft, LPS, SPS, and Non-Photosynthetic Corals - Tropic Marin All-for-Reef Liquid 500 ml. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.za/products/1627531-no3-po4-x-500ml-nopox-nitrate-and-phosphate-reducer-reef](https://www.desertcart.co.za/products/1627531-no3-po4-x-500ml-nopox-nitrate-and-phosphate-reducer-reef) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-08-28*